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Difference between revisions of "Node Relation"

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==Definition==
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#REDIRECT [[Entity Relation]]
A [[Relation]] is a relation stored as an [[Identity Attribute]] of a [[Digital Subject]] that links one [[Digital Subject]] to another [[Digital Subject]] in the same or within a different [[Context]].
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Note: If the two [[Digital Subject]]s being linked are digital representations of the same real-world [[Entity]] then a specialization of [[Relation]] called a [[Correlation]] should be used.
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==In Higgins==
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A [[Subject Relation]] is a URI. It is comprised of a [[ContextId]] URI combined with an optional identifier string called a [[SubjectId]] which if present is preceded by a forward slah, that uniquely identifies a [[Digital Subject]] within the [[Context]] identified by the [[ContextId]]. The [[SubjectId]] may only be omitted when the [[Context]] identified by the [[ContextId]] contains exactly one [[Digital Subject]].
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Two kinds of [[Relation]]s are defined a URIrelation (Hash URI) and XRIrelation. The former is consistent with one of the two proposed W3C's [http://www.w3.org/TR/2007/WD-cooluris-20071217/ Cool URIs] approaches. The latter is an [http://wiki.oasis-open.org/xri/XriCd02/Xri2dot0Abnf XRI 2.0].
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=== ABNF ===
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The following [http://en.wikipedia.org/wiki/Augmented_Backus-Naur_form ABNF] defines a Higgins [[Relation]]. Rules not defined in this ABNF are defined in the [http://wiki.oasis-open.org/xri/XriCd02/Xri2dot0Abnf ABNF for XRI 2.0] (which includes the IRI ABNF from [http://www.ietf.org/rfc/rfc3987.txt RFC 3987]).
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relation          = URIrelation / XRIrelation
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URIrelation        = contextURI [ "#" subjectId ]
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XRIrelation        = contextXRI [ "//" subjectId ]
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==See Also==
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* [[Correlation]]
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* [[SubjectId]]
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* [[ContextId]]
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* [[Concepts]]
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== Links ==
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* [http://eclipse.org/higgins Higgins Home]
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Latest revision as of 12:55, 22 April 2008

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